Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nang thai » nang tai, dang thai, lang thai
thai cua » than cua, tai cuc, tri cua
va nang » van nang, da nang, cam nang
cac duc » cao duc, cac dac, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky lang » ky dang, ky tang, tay lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh ((ky lang) OR (ky nang)) van hoi. hieu ve ((cac duc) or (cac du)) va nang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky nang)) van hoi. hieu ve ((cac duc) OR (cac du)) va nang thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky lang) OR (ky nang)) van hoi. hieu ve ((cac duc) or (cac du)) va nang thai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) OR (ky nang)) van hoi. hieu ve ((cac duc) or (cac du)) va nang thai cua tre*.